Feeder-head for rotary tube-mills.



PATENTED FEB. 18, 1908.

No. 879,435. I

W. N. BEACH. FEEDER HEAD FOR ROTARY TUBE MILLS.

APPLICATION FILED 0OT.12, 1906.

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WILLIAM N. BEACH, OF NEW YORK, N.

FEEDER-HEAD FOR ROTARY TUBE-MILLS.

Specification of Letters Patent.

Patented Feb. 18, 1908.

Application filed October 12. 1906. Serial No. 338.556-

To all whom it may concern:

Be it known that I, WILLIAM N. BEACH, a citizen of the United States,residing at New York city, in the county of New York and State of NewYork, have invented a new and useful Improvement in Feeder-Heads for R0-tary Tube-Hills, of which the following is a specification.

This invention relates to rotary tube mills of the type employed ingrinding cement and similar materials, and has special reference to animprovement in feeding mills of that character.

The invention primarily has in view a sim ple, practical, and thoroughlyefficient form of feeder head designed for use in connection with thattype of rotary tube mills embodying in its organization a rotary millshell or tube partially filled with grinding pebbles which, through theattrition caused by the tumbling action, serve to grind the finematerial introduced.

A special object of the invention is to provide a feeder head comprisingmeans for uni formly distributing the material to be ground into themill shell or tube at the most advantageous point for the starting ofthe grinding action, and also at such. an angle as to cause the materialto take up and follow the movement of the pebbles or balls in the mill.

With these and many other objects in view which will readily appear asthe nature of the invention is better understood, the same consists inthe novel construction,combination, and arrangement of parts hereinaftermore fully described, illustrated and claimed.

A preferred embodiment of the invention is shown in the accompanyingdrawings, in which:

Figure 1 is a sectional view of the feeding end portion of a rotary tubemill equipped with the improved feeder head contemplated by the presentinvention. Fig. 2 is a side or face elevation of the feeder head.

Like references designate corresponding parts in the separate figures ofthe drawings.

In carrying the invention into-effect no special changes are required'inthe construction of the usual parts of the ordinary type of rotary tubemill whichincludes in its construction a rotary,millgshell or i tubedesignated in the drawings by the numeral 1, and designed to bepartially filled with pebbles or balls tumbled about through therotation of the mill and thereby causing the grinding of the finematerial introduced therein.

The mill also includes as one of the elements thereof the main end head2 constituting the main closure for one end of the mill shell or tube 1and provided at the center thereof with an inlet opening 3 receivingmaterial which is primarily fed to the mill through the usual hollowtrunnion or sleeve 4. These parts of the mill are the common and usualones and the functions thereof are well understood by those familiarwith this art, but in connection with the present invention it is to beobserved that the main mill end head 2 is of a dished formation in crosssection and is provided with an inclined section 5 adjoining the end ofthe mill shell or tube and cooperating with the interior feeder turalformation the feeder head or diaphragm 6 substantially consists of acircular baffle plate of less diameter than the interior of the shell ortube 1 and having an imperforate body portion which is preferablyreinforcedby means of a plurality of integral reinforce webs or ribs 8provided upon the inner side of the plate body. The outer side of theplate body constituting the feeder diaphragm or head 6 is formed with amain central conical portion 9 concentrically disposed with reference tothe central inlet opening of the mill end head and serving as adeflecting and distributing surface over which the material is uniformlyspread in radial directions toward the periphery of the head. Theperipheral edge portion of the baffle plate constituting the feeder heador diaphragm, designated by the number 10, is set at an inclination inparallelism with the flat inclined section 5 of the main end head, andthis peripheral edge portion 10 is provided thereon with a thickenedlaterally offset distributing ring 11, which abuts directly against theinner side ofthe section 5 of the end head 1 and acts as the spacingblock or member which .holds the feeder head or diaphragm in spacedrelation to the end head, to provide the intervening feed chamher 7. Thetwo heads are held in this relative position through the medium of anysuita le fastenings or fastening connections, but a convenient andpracticalexpedient is shown in the accompanying drawings and resides inthe employment of a circular series of fastening bolts 12 extendingacross the feed chamber space 7 and secured in both the end head 5 andthe feeder head 6.

A special feature of importance in the present invention is that ofhaving the laterally ofiset distributing ring 11 pierced by a continuouscircular series of obliquely disposed feeding ports or holes 13 whichare preferably of a rectangular form in cross section as may be plainlyseen from both of the figures of the drawings. These feeding ports orholes extend in a closely arranged series and entirely about the circleof the offset distributing ring 11, and pierce said ring in a planeparallel with the inclined section 5 of the endhead 2 and the peripheraledge portion of the feeder head 6 as shown in the upper part of Fig. 1of the drawings, and it will be further observed that the said ports orholes 13 have their inner ends in communication with the feed chamber 7between the two heads, and their outer ends in communication with theinterior of the mill shell or tube 1 contiguous to the inner wall of thelatter. Furthermore, it is to be noted that the said ports or holes 13,in addition to their parallel relation to the elements 5 and 10, aredisposed obliquely to the radii of the feeder head. This obliquedisposition of the feeding ports or holes 13 pro vides for what may betermed a tangential feeding of material into the mill shell or tube,thereby causing the same to immediately take up and follow the rotationof the latter and the tumbling action of the grinding pebbles or balls.

vI claim:

1. The combinationwith the mill shell, and I ring having therein acontinuous series .of

obliquely disposed feeding ports or holes.

2. The combination of the mill shell, and the end head having aninclined portion and a central inlet opening, an interior feeder headarranged at the inner side of the end head in spaced relation theretoand provided at its peripheral edge portion with a laterally offsetdistributing ring abutting against the inclined portion'of said end headand provided therein with a continuous series of obliquely disposedfeeding ports or holes.

3. The combination with the mill shell, and the end head provided withan inlet opening, of an interior feeder head secured to the inside ofsaid end head in spaced relation therei to, said feeder being providedwith a central conical portion and a lateral offset peripheraldistributing ring in which are formed a series of feed ports or holes.in communication with the feed chamber between the two heads and'arranged oblique to the radii of the feeder

